Hi Ninin, You can make computations on an irregular shaped region by defining a mask, as outlined in this FAQ. It shows one method of defining the mask based on variable values, but all that's needed is some method of generating a field on the same grid which is 1 where you want to work with data and missing otherwise: http://ferret.pmel.noaa.gov/Ferret/faq/averaging-integrating-over-irregular-regions-1 Another tool is the pt_in_poly function. If what you have is a set of locations that defines the boundary, you could use that, and then define the mask from that. Ansley On 5/5/2014 4:05 AM, Nitin Patil wrote:
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